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fwidth |
Returns the absolute value of the partial derivatives of the specified value. |
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reference |
05/31/2018 |
Returns the absolute value of the partial derivatives of the specified value.
ret fwidth(x) |
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This function computes the following: abs(ddx(x)) + abs(ddy(x)).
This function is only supported in pixel shaders.
Item | Description |
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x |
[in] The specified value. |
The absolute value of the partial derivatives of the x parameter.
Name | Template Type | Component Type | Size |
---|---|---|---|
x | scalar, vector, or matrix | float | any |
ret | same as input x | float | same dimension(s) as input x |
This function is supported in the following shader models.
Shader Model | Supported |
---|---|
Shader Model 3 (DirectX HLSL) and higher shader models | yes |
Shader Model 2 (DirectX HLSL) | yes (ps_2_x only) |
Shader Model 1 (DirectX HLSL) | no |